3.1 Rounding And Estimating

Rounding And Estimating Section 3.1 By Ms. D-H

Rounding Decimals ,[object Object],[object Object],38. 4 1 0 .7772 7,098. 5 6 274.94 3 4 5. 0 25 9.8 5 1 Tenth, 38.4 Ones, 1 Tenths, 7,098.8 Thousandths, 274.943 Tenths, 5.0 Hundredths, 9.85

Estimating Sums and Differences ,[object Object],[object Object],[object Object]

Estimating with Decimals ,[object Object],+130  +125.73 590  590.63 460  464.90 Estimate Calculation

Try This: Estimate ,[object Object],[object Object],About 560 About 220

Front-End Estimating ,[object Object],[object Object],[object Object],[object Object]

Front-End Estimating ,[object Object],$ 1 .10 $ 1 .73 $ 2 .71 $ 4 . .10 .73 .71 . ? Estimate by Rounding. .10 .70 .70 1.50 Now add, $4 + $1.50 = $5.50 The total cost is about $5.50.

Try This: Estimating using Front-End Estimation. ,[object Object],[object Object]

Clustering ,[object Object],[object Object],What dollar amount do the 4 bills cluster around? $15.00 is our cluster value. 4 bills at,  $15 means 4 • $15 = $60 is  the total cost. August: $15.05 July: $14.90 June: $16.05 May: $15.35

Try This: Using Cluster Estimating ,[object Object],[object Object],About $15 About 125

Estimating Decimal Products and Quotients Section 3.2

Estimating Products ,[object Object],[object Object],[object Object],7.65 • 3.2 = ? 7.65 (by rounding) = 8 3.2 (by rounding) = 3 8 • 3  24 7.65 • 3.2  24

Try This: Estimating Products ,[object Object],[object Object],[object Object]

Word Problem!!! ,[object Object],$6.75  $7 $7 • 6 yards = $42 Rounded to the nearest dollar. Multiplied the estimate. The sales clerk made a mistake. Since $6.75 < $7, the actual cost should be less than the estimate. The clerk should have charged Arlene less than $42.00 before tax.

Try This: Word Problem ,[object Object],$4.79 is rounded to $5 $5 • 8 rolls = $40 $4.79 • 8  $40.00 Eight rolls of film at this price is about $40.00 total.

Estimating Quotients: Things to Remember ,[object Object],[object Object],[object Object],[object Object],24  8 = 3

Estimating Quotients ,[object Object],[object Object],38.9  1.79  11.95  2.1  82.52  4.25  1.79  2, 38.9  39, so 39  2 19 2.1  2, 11.95  12, so 12  2 6

Assignment #15 ,[object Object],[object Object],[object Object]

3.1 Rounding And Estimating

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3.1 Rounding And Estimating